GARbro-mirror/ArcFormats/DigitalWorks/ArcPAC.cs

100 lines
4.2 KiB
C#

//! \file ArcPAC.cs
//! \date 2018 Sep 18
//! \brief Digital Works resource archive.
//
// Copyright (C) 2018 by morkt
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using GameRes.Compression;
namespace GameRes.Formats.DigitalWorks
{
[Export(typeof(ArchiveFormat))]
public class PacOpener : ArchiveFormat
{
public override string Tag { get { return "PAC/HED"; } }
public override string Description { get { return "Digital Works resource archive"; } }
public override uint Signature { get { return 0x43415050; } } // 'PPAC-PAC'
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
public override ArcFile TryOpen (ArcView file)
{
if (!file.View.AsciiEqual (4, "-PAC"))
return null;
var hed_name = Path.ChangeExtension (file.Name, "hed");
if (!VFS.FileExists (hed_name))
return null;
using (var hed = VFS.OpenView (hed_name))
{
if (!hed.View.AsciiEqual (0, "PPAC-HED"))
return null;
uint index_offset = 0x10;
const uint data_offset = 0x10;
int count = (int)(hed.MaxOffset - index_offset) / 0x20;
if (!IsSaneCount (count))
return null;
var dir = new List<Entry> (count);
while (index_offset+0x20 <= hed.MaxOffset)
{
var name = hed.View.ReadString (index_offset, 0x10);
var entry = FormatCatalog.Instance.Create<PackedEntry> (name);
entry.Offset = hed.View.ReadUInt32 (index_offset+0x10) + data_offset;
entry.Size = hed.View.ReadUInt32 (index_offset+0x14);
if (!entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
index_offset += 0x20;
}
return new ArcFile (file, this, dir);
}
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var pent = entry as PackedEntry;
if (null == pent)
return base.OpenEntry (arc, entry);
if (!pent.IsPacked)
{
if (!arc.File.View.AsciiEqual (entry.Offset, "LZS\0"))
return base.OpenEntry (arc, entry);
pent.IsPacked = true;
pent.UnpackedSize = arc.File.View.ReadUInt32 (entry.Offset+4);
}
var input = arc.File.CreateStream (entry.Offset+8, entry.Size-8);
bool embedded_lzs = (input.Signature & ~0xF0u) == 0x535A4C0F; // 'LZS'
var lzs = new LzssStream (input);
if (embedded_lzs)
{
var header = new byte[8];
lzs.Read (header, 0, 8);
pent.UnpackedSize = header.ToUInt32 (4);
lzs = new LzssStream (lzs);
}
return lzs;
}
}
}